Invenio-collections

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- Package refactoring for Invenio 3.

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Incompatible changes
~~~~~~~~~~~~~~~~~~~~

- Moves automatically loaded rule for MARC field 980 to
contrib/dojson.py and adds the corresponding entry point for it so
dojson can collect it.

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Incompatible changes
~~~~~~~~~~~~~~~~~~~~

- Removes `recordext/functions` folder in favor of `invenio-records`.
- Removes legacy search extensions.
- Deprecates usage of `restricted_collection_cache`.
- Replaces legacy DataCachers with functions decorated by memoize
method from Flask-Cache. (7)

New features
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- Ports get_permitted_restricted_collections function from
`invenio_search` package.
- Adds simple admin interface to edit collection name and query. (1)

Bug fixes
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- Upgrades invenio-base minimum version to 0.3.0 and fixes an
incorrect import.
- Removes calls to PluginManager consider_setuptools_entrypoints()
removed in PyTest 2.8.0.
- Adds validation for collection names. Validation will be performed
each time the name is set. (10)
- Adds missing `invenio_base` dependency.
- Moves upgrade recipes into the right folder to be auto discovered.

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- Adds `_collections` key upon record update.
- Adds missing `invenio_access` dependency and amends past upgrade
recipes following its separation into standalone package.

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- Adds missing `invenio_upgrader` dependency and amends past upgrade
recipes following its separation into standalone package.

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- Initial public release.